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Standards for the classification of explosion-proof grades

by:Sure     2021-08-22
IEC explosion-proof grade standard IEC explosion-proof grade standard format: Ex(ia)ⅡC T4 An explosion is a substance that changes from one state, undergoes physical or chemical changes, and suddenly changes to another state, and releases huge energy. The energy released at a rapid speed will cause the surrounding objects to suffer violent impact and destruction. Three conditions must be met for explosion: 1) Explosive substances: can be compatible with oxygen IEC explosion-proof grade standard IEC explosion-proof grade standard format: Ex(ia)ⅡC T4 Explosion is a substance that changes from one state to another after physical or chemical changes. A state, and release a huge amount of energy. The energy released at a rapid speed will cause the surrounding objects to suffer violent impact and destruction. Three conditions must be met for explosion: 1) Explosive substances: substances that can react with oxygen (air), including gases, liquids and solids. (Gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solid: dust, fiber dust, etc.) 2) Oxygen: air. 3) Ignition sources: including open flames, electrical sparks, mechanical sparks, static sparks, high temperature, chemical reactions, light energy, etc. Why explosion-proof hazardous gas classification According to the minimum spark energy that may detonate, the International Electrotechnical Commission (IEC) standards adopted by China, Europe and most countries and regions in the world divide explosive gases into four hazard levels: explosion-proof level, explosion-proof level, temperature Group T1 T2 T3 T4Ⅱ A Ethane, propane, styrene, xylene, benzene, carbon monoxide, acetone, acetic acid, ammonia, pyridine ethanol, butane, propylene, ethyl acetate, dioxyethane, vinyl chloride, chloroethanol , Thiophene, cyclopentane, dimethylamine pentane, decane, ethyl cyclopentane, turpentine, naphtha, petroleum (including gasoline), fuel oil, pentanol tetrachloroethyl ether, trimethylamine II B propyne, Acrylonitrile, hydrogenated ammonia, coke oven gas ethylene, ethylene oxide, methyl acrylate, furan dimethyl ether, acrolein, tetrahydrofuran, hydrogen sulfide diethyl ether, dibutyl ether, tetrafluoroethylene, etc. Ⅱ C Hydrogen, water gas acetylene Ⅱ The maximum surface temperature of the class electrical equipment, the maximum surface temperature of the group temperature group ℃ T1 450T2 300T3 200T4 135T5 100T6 85 National standard GB regulations on explosion-proof grade standards: serial number explosion-proof type code national standard GB explosion-proof measures applicable area 1 explosion-proof type d GB3836. 2 Isolate the existing ignition source 2 Increased safety type GB3836.3 Try to prevent the generation of ignition source 3 Intrinsically safe type ia GB3836.4 Limit the energy of the ignition source intrinsically safe type ib GB3836.4 Limit the energy of the ignition source 4 Positive pressure type p GB3836 .5 Separation of hazardous substances from ignition sources 5 Oil-filled type o GB3836.6 Separation of hazardous substances from ignition sources 6 Sand-filled type q GB3836.7 Separation of hazardous substances from ignition sources 7 Non-sparking type n GB3836.8 Try to prevent ignition Source 8 Encapsulated type m GB3836.9 Try to prevent the generation of ignition source 9 Air-tight type h GB3836.10 Try to prevent the generation of ignition source Explosion-proof grade standard term: relevant explosion-proof term and standard safety barrier definition of safety parameters: *8226; maximum allowable safety barrier Voltage: Um guarantees the intrinsic safety performance of the intrinsically safe side of the safety barrier, and allows the highest possible input voltage of the non-intrinsically safe side*8226; the highest open circuit voltage of the safety barrier: Uoc the maximum voltage when the intrinsically safe side is open within the maximum allowable voltage range*8226; The maximum short-circuit current of the safety barrier: Isc in the maximum allowable voltage range when the intrinsically safe side is short-circuited *8226; the allowable distributed capacitance of the safety barrier: Ca The maximum allowable external capacitance of the intrinsically safe side under the condition of ensuring intrinsic safety performance *8226; safety barrier Allowable distributed inductance: La The maximum allowable external inductance for intrinsic safety under the condition of guaranteed intrinsic safety. Explosion-proof mark format description: According to the ignition energy, the minimum ignition temperature and the time period for the presence of explosive dangerous gases on the explosive dangerous medium of the factory or mining area Carry out scientific classification and grading to determine the explosion-proof mark of on-site explosion-proof equipment And explosion-proof form. Explosion-proof mark format: Ex(ia)ⅡC T4 explosion-proof mark Explosion-proof grade, gas group, temperature group, explosion-proof grade description: ia grade: Electrical equipment that cannot ignite explosive gas mixtures during normal operation, one failure and two failures. During normal operation, the safety factor is 2.0; for one failure, the safety factor is 1.5; for two failures, the safety factor is 1.0. Note: Contacts with sparks must be equipped with flameproof enclosures, air-tight enclosures or double the safety factor. ib level: electrical equipment that cannot ignite explosive gas mixtures during normal operation and a failure. In normal operation, the safety factor is 2.0; in case of a fault, the safety factor is 1.5. During normal operation, spark-proof contacts must be protected by flameproof enclosures or air-tight enclosures, and there are measures for self-display of faults. The safety factor is 1.0 for a fault.
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